This machine, apparently, hibernates correctly. Then, booting after the hibernation is complete, also apparently, unhibernates correctly. But, sometimes right after the image is uncompressed, sometimes after some command is executed in the console, sometimes later, you always end up with this same kernel panic (photos included in tarball):
https://en.roquesor.com/Downloads/panic.tar.gz As I mentioned to mlarkin@ and krw@ in private, I knew for certain that this didn't happen with this machine. I used to test how it hibernated because I had it connected to a UPS when I used it (for many years) as a home mail-web server. And even though it's an old machine, I still use it occasionally, which is why I took the time to do the trace back. After three days installing snapshots I could find out in which one the panic starts happening and which modification causes it. This is the last snapshot working fine (the number of the beast :-): https://openbsd.cs.toronto.edu/archive/2025-05-22/amd64 kern.version=OpenBSD 7.7-current (GENERIC.MP) #666: Wed May 21 00:12:25 MDT 2025 [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP And this is the first when the issue appears: https://openbsd.cs.toronto.edu/archive/2025-05-23/amd64 kern.version=OpenBSD 7.7-current (GENERIC.MP) #667: Thu May 22 22:13:35 MDT 2025 [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP The modification that causes the issue is this: https://marc.info/?l=openbsd-cvs&m=174779996216651&w=2 After reverting those Mike's diffs in current, the panic disappears. dmesg: OpenBSD 7.8-current (GENERIC.MP) #206: Thu Jan 15 00:37:15 MST 2026 [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP real mem = 4269477888 (4071MB) avail mem = 4113260544 (3922MB) random: good seed from bootblocks mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xeb920 (70 entries) bios0: vendor Hewlett-Packard version "786E1 v01.16" date 08/17/2011 bios0: Hewlett-Packard HP Compaq dc7700 Convertible Minitower acpi0 at bios0: ACPI 1.0 acpi0: sleep states S0 S3 S4 S5 acpi0: tables DSDT FACP APIC ASF! MCFG TCPA SLIC HPET acpi0: wakeup devices PCI0(S4) COM1(S4) PEG1(S4) IGBE(S4) PCX1(S4) PCX2(S4) HUB_(S4) USB1(S3) USB2(S3) USB3(S3) USB4(S3) USB5(S3) EUS1(S3) EUS2(S3) PBTN(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz, 1795.56 MHz, 06-0f-02, patch 0000005d cpu0: cpuid 1 edx=bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> ecx=e39d<SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM> cpu0: cpuid 6 eax=1<SENSOR> ecx=1<EFFFREQ> cpu0: cpuid a vers=2, gp=2, gpwidth=40, ff=0, ffwidth=0 cpu0: cpuid 80000001 edx=20100800<NXE,LONG> ecx=1<LAHF> cpu0: MELTDOWN cpu0: 32KB 64b/line 8-way D-cache, 32KB 64b/line 8-way I-cache, 2MB 64b/line 8-way L2 cache cpu0: smt 0, core 0, package 0 mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges cpu0: apic clock running at 199MHz cpu0: mwait min=64, max=64, C-substates=0.2, IBE cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz, 1795.66 MHz, 06-0f-02, patch 0000005d cpu1: smt 0, core 1, package 0 ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 24 pins, remapped acpimcfg0 at acpi0 acpimcfg0: addr 0xf4000000, bus 0-63 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus -1 (PEG1) acpiprt2 at acpi0: bus 32 (PCX1) acpiprt3 at acpi0: bus -1 (PCX2) acpiprt4 at acpi0: bus 7 (HUB_) acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001 acpicmos0 at acpi0 "PNP0F13" at acpi0 not configured "PNP0303" at acpi0 not configured com0 at acpi0 COM1 addr 0x3f8/0x8 irq 4: ns16550a, 16 byte fifo "PNP0003" at acpi0 not configured acpibtn0 at acpi0: PBTN(wakeup) "PNP0C14" at acpi0 not configured acpicpu0 at acpi0: C1(@1 halt!), PSS acpicpu1 at acpi0: C1(@1 halt!), PSS cpu0: Enhanced SpeedStep 1795 MHz: speeds: 1800, 1200 MHz pci0 at mainbus0 bus 0 pchb0 at pci0 dev 0 function 0 "Intel 82Q965 Host" rev 0x02 inteldrm0 at pci0 dev 2 function 0 "Intel 82Q965 Video" rev 0x02 drm0 at inteldrm0 intagp0 at inteldrm0 agp0 at intagp0: aperture at 0xe0000000, size 0x10000000 inteldrm0: apic 1 int 16, I965G, gen 4 em0 at pci0 dev 25 function 0 "Intel ICH8 IGP AMT" rev 0x02: apic 1 int 19, address 00:0f:fe:77:4f:df uhci0 at pci0 dev 26 function 0 "Intel 82801H USB" rev 0x02: apic 1 int 20 uhci1 at pci0 dev 26 function 1 "Intel 82801H USB" rev 0x02: apic 1 int 21 ehci0 at pci0 dev 26 function 7 "Intel 82801H USB" rev 0x02: apic 1 int 22 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 azalia0 at pci0 dev 27 function 0 "Intel 82801H HD Audio" rev 0x02: apic 1 int 21 azalia0: codecs: Realtek ALC262 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 82801H PCIE" rev 0x02 pci1 at ppb0 bus 32 uhci2 at pci0 dev 29 function 0 "Intel 82801H USB" rev 0x02: apic 1 int 20 uhci3 at pci0 dev 29 function 1 "Intel 82801H USB" rev 0x02: apic 1 int 21 ehci1 at pci0 dev 29 function 7 "Intel 82801H USB" rev 0x02: apic 1 int 20 usb1 at ehci1: USB revision 2.0 uhub1 at usb1 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb1 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xf2 pci2 at ppb1 bus 7 pcib0 at pci0 dev 31 function 0 "Intel 82801HO LPC" rev 0x02 pciide0 at pci0 dev 31 function 2 "Intel 82801H SATA" rev 0x02: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI pciide0: using apic 1 int 18 for native-PCI interrupt wd0 at pciide0 channel 0 drive 0: <KINGSTON SA400S37240G> wd0: 1-sector PIO, LBA48, 228936MB, 468862128 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 6 usb2 at uhci0: USB revision 1.0 uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci1: USB revision 1.0 uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci2: USB revision 1.0 uhub4 at usb4 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb5 at uhci3: USB revision 1.0 uhub5 at usb5 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at pcib0 isadma0 at isa0 fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 pckbc0 at isa0 port 0x60/5 irq 1 irq 12 pckbd0 at pckbc0 (kbd slot) wskbd0 at pckbd0: console keyboard pms0 at pckbc0 (aux slot) wsmouse0 at pms0 mux 0 pcppi0 at isa0 port 0x61 spkr0 at pcppi0 lpt0 at isa0 port 0x378/4 irq 7 vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets root on wd0a (14e7147b497b7d69.a) swap on wd0b dump on wd0b inteldrm0: 1680x1050, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0 wsdisplay0: screen 1-5 added (std, vt100 emulation) usbdevs: Controller /dev/usb0: addr 01: 8086:0000 Intel, EHCI root hub high speed, self powered, config 1, rev 1.00 driver: uhub0 Controller /dev/usb1: addr 01: 8086:0000 Intel, EHCI root hub high speed, self powered, config 1, rev 1.00 driver: uhub1 Controller /dev/usb2: addr 01: 8086:0000 Intel, UHCI root hub full speed, self powered, config 1, rev 1.00 driver: uhub2 Controller /dev/usb3: addr 01: 8086:0000 Intel, UHCI root hub full speed, self powered, config 1, rev 1.00 driver: uhub3 Controller /dev/usb4: addr 01: 8086:0000 Intel, UHCI root hub full speed, self powered, config 1, rev 1.00 driver: uhub4 Controller /dev/usb5: addr 01: 8086:0000 Intel, UHCI root hub full speed, self powered, config 1, rev 1.00 driver: uhub5 -- Walter
